irrationality
Americannoun
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the quality or condition of being irrational.
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an irrational, illogical, or absurd action, thought, etc.
noun
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the state or quality of being irrational
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irrational thought, action, or behaviour
Other Word Forms
Etymology
Origin of irrationality
First recorded in 1560–70; irrational + -ity
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
At least one fellow, however, thought the addition represented a surrender to the forces of superstition and irrationality.
From The Wall Street Journal • Jan. 4, 2026
But Panamanian President Jose Raul Mulino said Sunday that "there is no justification whatsoever for the barbarity committed," calling it "an unforgivable act of irrationality."
From Barron's • Dec. 28, 2025
It’s simply a matter of taking advantage of structural market irrationality.
From MarketWatch • Dec. 26, 2025
Through the animal’s point of view, De Los Santos Arias considers the enduring grip of colonialism and the consequences of human irrationality.
From Los Angeles Times • Dec. 22, 2025
Like the proof of the irrationality of V2, like the discussion of simultaneity in special relativity, this is an argument in which the premise is challenged because the conclusion seems absurd.
From "Cosmos" by Carl Sagan
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
